Figure 6: Sensitivity to hydrogen peroxide. The wt, waaL- and waaL + bacteria were exposed to 20 mM H2O2 for 30 min and then spread onto a plate. The survival rate was represented by colony counts of the bacteria exposed to H2O2 vs. colony counts of the bacteria exposed to blank control. The plot presented the data from three replicates. Different letters indicate significant difference between survival rates. (Student T test, P<0.001).